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calculate form values from radio group

Trying to calculate a selection value from a radio group and values from other fields. Any 'Name' input adds a value to the Total. I need the value from the radio group to be added to that total. Here is the HTML:

What am I missing? By the way, in case it is not clear, I am a JS novice, so I fully accept criticism that helps me understand a more fundamental error in my approach. Simple is best for me: ;-) Thank you in advance.

Thank you, tech_soul8. This is almost it, except I need the radio group value to populate the total even if no other entry is made. All values need to be totaled, but only the radio value should be required. If only the radio value, then the total should only be that. If other values, they get added to it. A selection of a radio value should immediately add that value to the total. As I write this, I realize an added complexity in that if someone changes their mind about the radio value, the total needs to reflect that change. I'm so hoping you can help me...